How do I identify Grunerite?

Grunerite can be identified by its hardness of 5 - 6 on the Mohs scale, nd color. Look for these key characteristics when examining specimens.

What color is Grunerite?

Grunerite typically appears in nd. Color can vary depending on impurities and formation conditions.

How hard is Grunerite?

Grunerite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.

How to Identify Grunerite | Properties, Meaning & Uses

What is Grunerite?

Grunerite is a mineral of the amphibole group of minerals with formula Fe7Si8O22(OH)2. It is the iron endmember of the grunerite-cummingtonite series. It forms as fibrous, columnar or massive aggregates of crystals. The crystals are monoclinic prismatic. The luster is glassy to pearly with colors ranging from green, brown to dark grey. The Mohs hardness is 5 to 6 and the specific gravity is 3.4 to 3.5. It was discovered in 1853 and named after Emmanuel-Louis Gruner (1809–1883), a Swiss-French chemist who first analysed it.

Grunerite Market Value Calculator

Estimate the market value of Grunerite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Grunerite Localities Map

See where Grunerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

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North ZoneCentral RidgeSouth Basin

Quick Facts

Physical Properties

Color: nd
Hardness (Mohs): 5 - 6
Streak: nd

Chemical Properties

Chemical Formula: {Fe2+2}{Fe2+5}(Si8O22)(OH)2 Grunerite is defined as a monoclinic amphibole belong to the magnesium-iron-manganese amphibole subgroup. It is defined with Fe2+ as the dominant element both in the B and C positions.
Elements: Fe, H, O, Si

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